Device for preventing the return of waste water into water-supply pipes.



} R. STIOKDORN. DEVICE FOR PREVENTING THE RETURN OF WASTE WATER INTOWATER SUPPLY PIPES.

APPLIOATION FILED NOV. 3, 1908.

926,968. Patented July 6, 1909.

chamber valve-disk carries UNITED srnrns r rnnr OFFICE.

ROBERT STIOKDORN, OF DUSSELDORF, GERMANY.

DEVICE FOR PREVENTING THE RETURN OF WASTE WATER INTO WATER-SUPPLY PIPES.

Specification of Letters Patent.v

Patented July 6, 1909.

Application filed November 3, 1908. Serial No. 460,890.

' To all whom it may concern:

7 Be it known that I, Ronnnr SrroKDoRN, a citizen of the German Empire,residing at Lindenstr'asse No. 251 Dusseldorf, in the Province ofRhineland and Kingdom of Prussia, Germany, have invented new and usefulImprovements in Devices for Preventing the Return of Waste WVater intoWater- Supply Pipes, of which the following is a specification.

The present invention relates to a contrivance, guarding the housewater-pipings against return-suction of refuse-water from tanks orsimilar receptacles connected with tapping-devices and securing theflowing out of the water from the conduits in pure condition.

In order that the invention may be more clearly understood, reference ismade to the accompanying drawings, in which similar numerals refer tosimilar parts throughout the several views. l

The two views represent two longitudinal sections of the object of theinvention and Figure 1. is a valve, when under hydraulic pressure. Fig.2 shows the valve when the evacuation of the piping takes place.

The air-supply 9 discharges into the valveadapted to be dismounted,section 1, being provided with a discharge faucet 20: The air-supplyitself is likewise connected with the valve-chamber 10, the latter beingprovided with an opening 8 protected against the falling-in of mud bymeans of a hood. The closing-member 2, arranged in the chamber 10 sothat it can be lifted, is shaped in form of a belland its upper surfaceis ada ted for establishing a tight closure in com ination with thevalve-seat 5. The guides 12 having at their bottom end the form of shortfeet. When the water is rising in the water conduit-pipe it ejects theair therein contained and the latter can without further ado pass upvilardly underneath and along the sides of t e through the opening 8 ofthe id 11., f, however, the water is finally taken to the chamber, itrises in this and closes the hollow room of the bell-shapedvalve-disk 2at its bottom, in such way that the air it contains remains therein. Nowthe water produces a powerful lifting effect on the closing-memcr, bywhich means it bears tightly against provided with the formed by twopieces 1 and 3 valve-disk 2 and thereu on esca ev the seat 5, before thewater entirely fills the chamber 10.

Below the bell-shaped valve-disk 2 a second or auxiliary valve-disk 15provided with openings 14. and also shaped in form of a bell, isarranged, acting in such a manner, that, while a discharge of watertakes place, it allows the water contained in the valvechamber and thevalve to flow out without check and also allows the air entering at thetop into the chamber to ass in sufficient quantity into the piping, 1norder that no water from branchconduits can be sucked up; on the otherhand, when the water is permitted again to enter, it allows only of aslow admission of the air and of the water into the valve-chamber andinto the valve, preventing itin this way from being closed too early.

The member 15, placed below the bell 2 valve closing-device 5, isperforated at its upper end and provided with an edge 16. The hollowmember 15 passes outwardly through an opening 17 of a disk or bottom 18respectively, arranged below the valve-closure and covered at the bottomwith a packing-disk 19. If, on admitting water, this enters quickly intothe piping, so as to eject instantaneously the air, the latterimmediately lifts the bottom-bellshaped member 15, whereupon its edge 16is placed against the disk 19, in order that the air may enter slowlythrough the openings 14 into the valve chamber from which it emanates bymeans ofthe opening 8. The air entering slowly into the valve chamberand into the valve cannot lift the bell 2; it is rather-as requirednotlifted before the water rises to such a level,'thatit partly fills thechamber. When the piping is filled with water and the valve is closedthe member 15 lowers again and on discharge of the water from the pipingthe air can enter in sufhcient quantity through the valve seats so as toretain no water in the piping and to prevent the water contained in thebranch-conduits from being sucked up.

The valve chamber 1, 3 is inserted into the water-piping in such amanner, that the water enters at its bottom and flows out at its top.The valve closing member 13 rests with its packing disk on the seat 4.When the inletpiping is not interrupted such memher is lifted by theWater flowing out and at the upper end it bears against supports notpreventing the passage of the water; on the other hand, owing to thehydraulic ressure, and to the air, contained in the befi-shaped valvedisk 2 the latter is pressed against the seat and does not allow thewater to run out. If now, however, the piping is turned off andevacuated, the valve-disk 13is presseddown by means of the water columnresting on it, and likewise the valve-disk 2 falls and the air-piping isopened. The water conduit pipe 7 above t e valve 13 is consequentlyclosed, but a suflicient quantity of air is allowed to enter into thepiping.

It will be seen that the device above described provides means forsimultaneously admitting air to the discharge faucetwhen tapping watertherefrom, so that any undue suction in the various branchescommunicating with the water supplypipe is prevented.

I claim 1 In a device of the character described, a water supply pipe, awater conduit pipe, a first valve casing intermediate said pipes andhaving a discharge faucet, a valve disk inclosed within the casing andcontrolling cornmunication between the pipes, a second valve casingcommunicating with the first valve casing below said valve disk andhaving an upper air opening, a float valve within said second casing andadapted to close said open ing, and an auxiliary valve intermediate thefirst and second valve casings.

2. In a device of the character described, a water supply pipe, a firstvalve casing com- Inunicating therewith, a valve disk inclosed withinsaid first casing, a second valve casing communicating with said firstcasing and having an upper air opening, a first bellshaped valve havingfeet and adapted to close said air opening, and a second bellshapedvalve adapted to control communication between said first bell-shapedvalve and the first valve casing.

ROBERT STICKDORN.

Witnesses: I

LOUIS VANDoRN, BESSIE F. DUNLAP.

